The Apache Traffic Server (TS or ATS) is a modular, high-performance reverse proxy server, generally comparable to Squid. It was created by Inktomi, and distributed as a commercial product called the Inktomi Traffic Server, before Inktomi was acquired by Yahoo!. Traffic Server has been actively used inside of Yahoo for over 4 years, serving billions of requests every day. As of fall 2009, Traffic Server is an Open Source project, and in April 2010 the Apache Traffic Server was promoted to a top-level project of the ASF.

CacheGuard Appliance is an all-in-one OS appliance providing firewall, antivirus, caching, compression, bandwidth allocation, load balancing, reverse and forward proxy, high availability, Web application firewall, URL guarding, and more. It can be purchased as an OS to install on your server, as an OS to run in a virtual machine, or as a hardware appliance.

DirectMemory is an off-heap cache implementation (a la BigMemory) to enable in-memory serialization of a large number of Java objects without affecting JVM garbage collection performance. Although serialization makes things slower, put/get operations are well in the sub-millisecond range, which is pretty acceptable in every usage scenario. DirectMemory implements cache eviction based on a simple LRU (Less Recently Used) algorithm and on item expiration.

HybridCache is a PHP package for managing a cache with the data storage abstracted. Internally, the storage media is used as a key/value dictionary, but any other method can be adapted (e.g., SQLite), and many different methods can be used in the same instance.

QuickFind is a cross-platform Java application for searching files in your computer.
Its sole purpose is to save user time by searching the desired file almost
instantly.
It is designed to support all of the major computer platforms.
The user can schedule caching or manually cache at any time on selected directories.
Once the caching is done, all you have to do is input the name of the file you want to find.

SafariCacheExplorer allows you to recover an image, video, sound, or style sheet from your Safari cache. It is also a tool for Web developers: it allows you to delete individual cache files, helping you to develop and test your Web sites more quickly using Safari.

SynCache::Cache stores cached objects in a Hash that is protected by an advanced two-level locking mechanism. Two-level locking ensures that: Multiple threads can add and fetch objects in parallel without stepping on each other’s toes; while one thread is working on a cache entry, other threads can access the rest of the cache with no waiting on the global lock, race conditions, or deadlock or livelock situations; and while one thread is performing a long and resource-intensive operation, other threads that request the same data with #fetch_or_add method will be put on hold, and as soon as the first thread completes the operation, the result will be returned to all threads. Without this feature, a steady stream of requests with less time between them than it takes to complete one request can easily bury a server under an avalanche of threads all wasting resources on the same expensive operation.

adsuck is a small DNS server that spoofs
blacklisted addresses and forwards all other
queries. The idea is to be able to prevent
connections to undesirable sites such as ad
servers, crawlers, etc. It can be used locally,
for the road warrior, or on the network perimeter
in order to protect local machines from malicious
sites.